Dry cell.



G. L. TARVER.

DRY CELL.

APPLICATION FILED JAN.4.1915.

Patented Oct. 31,1916,

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. HLIILIIIILIL ILJLLLLLLI GEORGE LOUIS WARNER',4 OF OAKLAND, GALIFOBIA.

DRY CELL.

specification ofrettvers Patent. Patented (M331, 1916,

Application filed January 4, 1915. Serial No. 487.

To all lwhom t may concern Be it known that I, GEORGE LoUrs TAnvER,

a citizen of the United States, residing at Oakland, in the county ofAlameda and 5 State of'California, have invented 'certain new and usefulImprovements lin Dry Cells, of which the following is a speciiication.

This invention relates to new and;useful improvements in dry cells, theprimary object of the invention being the provision of a dry cell whichwill be more efficient, which will generate more electrical energy and'which Will not deteriorate as rapidly.

A further object of the invention consists inthe provision of a dry cellin which all parts of the cell are electro-,chemically active, therebyavoiding waste.

In this connection, a still further object vof theinvention is to doaway with the usual the cell, which closure is of waxV and toreplacethis by a zinc cap in order that the cap, as well as. thecup or body ofthe cell, may form an active .constituentI of the cell.

With these and-.other objects ,in view, the invention will be more fullydescribed, illustrated` in the accompanying drawing, and thenspecifically pointed` out in the claim which is attached to Aand forms apart of this application.

In the drawing: Figure 1 is a fragmentary perspective view of a dry cellconstructed in accordance with' my invention; Fig. 2 is a` centralvertical sectional view of the type of cell shown in Fig. 1 Fig. 3 is aview corresponding t that shown in Fig. 2,

illustrating a somewhat modified form-of construction. e

Corresponding `and like parts are referred to in the followingVdescription andindicated in all the views of the drawings by the vsamereference characters.'

The limproved dry cell includes a cup or body 10 of zinc forming thepositive electrode of the cell and having a bottomll also of vzinceither formed integrally y'with lthe body portion 10 or soldered in thellower end thereof as shown in Fig. 2. This zinc cup fis lined with anysuitable lining 12. suchy as is commonly used inthe manufacture of drycells and the semilastic mass 13y carry- .ingthe liquid electro yte isplaced in' this cup, the lining being extended over lthis electrolyte asshown at leand provided with a 155 central opening to receive thenegative elec- I 'trode f15. This electrode-l is -infthef-.form' ofclosure for the zinc cup forming the body of a carbon rod or bar andextends at its lower end nearly to the bottom of the cupv 10.

The upper end of. the cup is closed by a Zinc cap 16 provided with acentral opening surroundedby an upstanding annular `iange 17 which isspaced from the negative electrede 15. The peripheral edge lof the capis also provided with lan upstanding flange 18 which fits snugly in theupper end of the cup, being soldered to the wall of the cup to providean absolutely tight closure. A relatively small amount of wax 19 islemployed' to seal and secure the negative electrode 15 in the. centralopening of the -cap 16, this wax not only serving as a securing meansfor the electrode but also as a means for insulating` the negativeelectrode 15 from the cap 16 which forms a portion of the positiveelectrode of the cell. .Y

:The outer end. of the negative electrode 15 is, preferably, providedwith a metallic cap 20 having a binding post 21 of any suitableconstruction. A second binding post 22 is secured to the cup in anysuitable manner. In Fig. 2- I have illustrated this binding postas-including a bifircated body portion '23, the arms ofwhich straddlethe upstanding edge of the cup 10 to-which they are soldered orotherwise suitably secured.v

In Fig. 3 I have illustrated aslightly modified form of the invention inwhich the soleV difference consists in the fact that the cap or closure,here indicated by the numeral 24, instead of having the upturnedmarmarginal flange 25 proportioned to it snugly about the upper end ofthe cell 10 and to be soldered lto theV cell.

As will be readilyappreciated from-the foregoing description, all partsof theucell, save the relatively small amount of wax employed, areelectro-chemically active, the en- 'l tire cup and cap forming thepositive '-electrode, while the carbon'rod formsthenegative electrode.Practically, the entire length ofthe carbon rod is surrounded by theelectrolyte,'under these circum'.-;ta,nces,l whereas with theconventionaltype of dry cell, a half inchto an inch of this rod isrendered inactive by being surrounded with 4 fthe wax employed as a;seal for the cup. .'Furthermore, this wax so employed is notA only aninactive element Iin the cell, but

effect offers considerable resistance to the current and increases theresistancefof the cell. addition Ato this, a wax closure is 90:. .vginal flange 18, is formed with a downturned f tional whether the metalcap is soldered to the body or Whether its edges and the-edges of thebody are turned and pressed together or whether it has threadedengagement with the body or in fact in what manner it is secured to thebody. The surface of the cup and cap may be smooth, roughened, orcorrugated and such parts may be made in any desired shape and size. Ihave not illustrated any method of folding and pressing the edges of thebody and cap or the body or bottom together as such sheet metal jointsare well known. However, it will be clear that the use of such jointswill obviate the necessity of soldering the parts together and Itherefore do not wish to be limited to any specific manner of fasteningsuch parts.

Having thus described' the invention, what is claimed as new is:

A dry cell including a cup, av cap itted to the top of the cup andprovided with an upstanding flange defining an opening, said'cap and cuptogether constituting a positive electrode, an electrolyte filling thecup, a negative electrode extending through the openlng in the cap andinto the electrolyte and spaced from the ange, and a body of insulatingmaterial interposed between the,

flange and negative eleetrode'and disposed in direct contact therewlth,the cap between the flange and cup being imperforate.

In testimony whereof I affix my signature invpresence of two witnesses.-l

GEORGE LOUIS TARYER. h.. si

Witnesses:

A. L. MORRISON, F. ANDERSON.

